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`levels
...eadability reasons, I would say it never makes sense because `levels<-`(foo,bar) is the same as levels(foo) <- bar. Using @Marek's example: `levels<-`(as.factor(foo),bar) is the same as foo <- as.factor(foo); levels(foo) <- bar.
– Joshua Ulrich
...
Replace one character with another in Bash
...
Use inline shell string replacement. Example:
foo=" "
# replace first blank only
bar=${foo/ /.}
# replace all blanks
bar=${foo// /.}
See http://tldp.org/LDP/abs/html/string-manipulation.html for more details.
...
Watch multiple $scope attributes
... new method called $watchGroup for observing a set of expressions.
$scope.foo = 'foo';
$scope.bar = 'bar';
$scope.$watchGroup(['foo', 'bar'], function(newValues, oldValues, scope) {
// newValues array contains the current values of the watch expressions
// with the indexes matching those of th...
Parsing JSON using Json.net
... public int x { get; set; }
public int y { get; set; }
}
public class Foo
{
public Foo() { objects = new List<SubObject>(); }
public string displayFieldName { get; set; }
public NameTypePair fieldAliases { get; set; }
public PositionType positionType { get; set; }
publ...
How can I use if/else in a dictionary comprehension?
... the following dictionary of sets
d = {'key1': {'a', 'b', 'c'}, 'key2': {'foo', 'bar'}, 'key3': {'so', 'sad'}}
and you want to create a new dictionary whose keys indicate whether the string 'a' is contained in the values or not, you can use
dout = {"a_in_values_of_{}".format(k) if 'a' in v else ...
Ruby - elegantly convert variable to an array if not an array already
...
[*foo] or Array(foo) will work most of the time, but for some cases like a hash, it messes it up.
Array([1, 2, 3]) # => [1, 2, 3]
Array(1) # => [1]
Array(nil) # => []
Array({a: 1, b: 2}) # =>...
“No newline at end of file” compiler warning
... front of the file and does not insert the new line after the #include <foo.h> after the contents of the file. So if you include a file with no newline at the end to the parser it will be viewed as if the last line of foo.h is on the same line as the first line of foo.cpp. What if the last lin...
How can I modify the size of column in a MySQL table?
...tomatically converts it to a MEDIUMTEXT data type.
mysql> create table foo (str varchar(300));
mysql> alter table foo modify str varchar(65536);
mysql> show create table foo;
CREATE TABLE `foo` (
`str` mediumtext
) ENGINE=MyISAM DEFAULT CHARSET=latin1
1 row in set (0.00 sec)
I misread ...
How to do parallel programming in Python?
...
from joblib import Parallel, delayed
You can simply create a function foo which you want to be run in parallel and based on the following piece of code implement parallel processing:
output = Parallel(n_jobs=num_cores)(delayed(foo)(i) for i in input)
Where num_cores can be obtained from mult...
初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...据：
INSERT INTO `users` (`username`, `password`, `email`)
VALUES
('foo', 'ffffffffffffffffffffffffffffffff', 'foo@domain.com'),
('bar', 'bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb', 'bar@domain.com');
接着在containers里配置这个表：
INSERT INTO innodb_memcache.containers (
name, db_...